topic Re: Impervious Surface Mapping - Arc 9.3.1 in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/impervious-surface-mapping-arc-9-3-1/m-p/645692#M9330 <HTML><HEAD></HEAD><BODY><SPAN>Although his is absolutely possible in Arc it does sound like more of a "Remote Sensing" application which tends to be more intuitive using software such as ERDAS and others.</SPAN></BODY></HTML> Tue, 31 May 2011 16:24:17 GMT KylePurdon 2011-05-31T16:24:17Z Impervious Surface Mapping - Arc 9.3.1 https://community.esri.com/t5/arcgis-spatial-analyst-questions/impervious-surface-mapping-arc-9-3-1/m-p/645691#M9329 <HTML><HEAD></HEAD><BODY><SPAN>I am working on a watershed assessment and am trying to use the maximum likelihood classification within the Spatial Analyst toolbar for ArcGIS 9.3.1 to map the impervious surface areas in a particular watershed.&nbsp; I am having trouble creating signature files on arc and continue to get syntax errors when i run the create signatures tool.&nbsp; I have created a new polygon shapefile and outlined training samples and Im not sure what i'm doing wrong.&nbsp; If anyone has any information on Impervious Surface Mapping using Arc 9.3.1 it would help me greatly.&nbsp; Also, if anyone thinks that an accurate assessment isn't possible with arc then please let me know so I can put in a request for Erdas Imagine.&nbsp; I just want to wait a little longer to see if I can get it to work accuratly with Arc first.&nbsp; Please help....</SPAN></BODY></HTML> Wed, 20 Apr 2011 17:01:13 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/impervious-surface-mapping-arc-9-3-1/m-p/645691#M9329 JakeMoore 2011-04-20T17:01:13Z Re: Impervious Surface Mapping - Arc 9.3.1 https://community.esri.com/t5/arcgis-spatial-analyst-questions/impervious-surface-mapping-arc-9-3-1/m-p/645692#M9330 <HTML><HEAD></HEAD><BODY><SPAN>Although his is absolutely possible in Arc it does sound like more of a "Remote Sensing" application which tends to be more intuitive using software such as ERDAS and others.</SPAN></BODY></HTML> Tue, 31 May 2011 16:24:17 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/impervious-surface-mapping-arc-9-3-1/m-p/645692#M9330 KylePurdon 2011-05-31T16:24:17Z